An economy that relies on a system of interdependent market prices to allocate goods, services, and productive resources and to coordinate the diverse plans of consumers and producers, all of them pursuing their own self-interest.

Places, institutions or technological arrangements
where or by means of which goods or services are exchanged. Also, the set of all sale and purchase transactions that affect the price of some good or service.

Anything that is generally accepted as final payment for goods and services; serves as a medium of exchange, a store of value and a standard of value. Characteristics of money are portability, stability in value, uniformity, durability and acceptance.

Effort applied to achieve a purpose or result, often for pay; skills and knowledge put to use to get something done; employment at a job or in a position; occupation, profession, business, trade, craft, etc.